Zynga Elite Slots is this week's fastest-growing Facebook game by MAU, bringing in 10.6 million monthly active users for a 177 percent gain. Last week Zynga Slots also came in at the No. 1 spot with 4.3 million monthly active users for a 247 percent gain.

Pretty Simple'sCriminal case took No. 2, up 9 percent with 1.5 million MAU. Playdom's Words of Wonder came in at the No. 3 spot with 1 million MAU and a 209 percent gain, amounting a total of an estimated 1.6 million MAU. Zynga's Words With Friends dropped to the No. 4 spot with 793,315 MAU, up 5 percent. King's Bubble Witch Saga completes the top five games on the list with a 4 percent increase of 716,426 MAU.